A Hydrogen Nucleus (A Proton) Has a Charge of +1

Multiple Choice

A hydrogen nucleus (a proton) has a charge of +1, and a helium nucleus has a charge of +2. Why, then, does it require four protons to form helium in the core of the Sun?

A) Two of the protons are converted into neutrinos.
B) Two of the protons become neutrons.
C) Two of the protons are ejected back into the solar material.
D) Two helium nuclei are formed from the four protons.